Since Home Assistant has built in Bluetooth support, a service to write data on a BLE characteristic would be useful. Ideally this shouldn’t be needed as support for specific Bluetooth devices should be added as integrations in HA’s main trunk, but this requires a good understanding of the HA’s code (how to implement a config flow, etc) and sometimes you just need something simple like triggering an action by writing on a ESP32 exposed characteristic, for example.
Currently I made a pyscript script for personal use which implements a ble_write
service, but I would love a built-in service for that.